Memory keeps increasing even if system left idle

Extjs 2.0.2
Internet Explorer 6
Windows

I came across very strange issue in IE6, in which memory usage for IExplore process keeps on increasing (can see in the task manager - Processes - IExplore Process memory usage) Even if system is left idle in browser

Also, is their any patch for Extjs 2.0.2 application for internet explorer 6 because object memory is not released even if panel is destroyed or window is closed.

we had already develop huge application in extjs as like desktop application , it works fine and smooth in firefox but performance is really became bottleneck in IE.now this application is of no use until their is any feasible solution for application to work in IE.